Methods and Systems for Generating a Low Peak-To-Average Power Ratio (papr) Data and Reference Signal

1. A method for generating a signal in a communication network, the method comprising: filtering, by a transmitter, a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) data signal, and one of a pi/2 rotated Binary Phase Shift Keying (BPSK) reference signal (RS), 8 Phase Shift Keying (8-PSK) RS, and Zadoff-Chu (ZC) RS, using a data filter and a RS filter respectively, to produce filtered data signal and filtered RS, said RS filter having one to one relationship with the data filter; and port mapping, by the transmitter, the filtered RS to a corresponding port assigned to the transmitter to obtain port mapped filtered RS, wherein the port mapped filtered RS comprises a first subset of non-zero locations comprising of the filtered RS values and a second subset of zero locations comprising of zero values.

2. The method of claim 1, wherein the method comprises obtaining the DFT-S-OFDM data signal by rotating a modulated data sequence, said modulated data sequence is BPSK data sequence and rotation is performed on consecutive samples of the data sequence by 90-degrees.

3. The method of claim 1, wherein the method comprises indicating characteristics of one of RS filter and data filter explicitly to a receiver.

4. The method of claim 1, wherein a time domain impulse response of the RS filter is equal to the corresponding time domain impulse response of the data filter.

5. The method of claim 1, wherein a plurality of frequency domain coefficients of the RS filter comprises a subset with a fixed number of frequency domain coefficients corresponding to the data filter.

6. The method of claim 5, wherein the frequency domain coefficients of the RS filter comprises even set of frequency domain coefficients corresponding to the data filter.

7. The method of claim 5, wherein the frequency domain coefficients of the RS filter comprises odd set of frequency domain coefficients corresponding to the data filter.

8. The method of claim 1, wherein the RS filter frequency domain coefficients comprises at least one of even subset of frequency domain coefficients corresponding to the data filter for a port number zero, and odd subset of frequency domain coefficients corresponding to the data filter for the port number one, for number of ports equal to two.

9. The method of claim 1, wherein filtering the one of the pi/2 BPSK RS, the 8-PSK RS, and the ZC RS is one of port dependent and port independent.

10. The method of claim 1, wherein filtering the DFT-S-OFDM data is port independent.

11. The method of claim 1, wherein the method comprises transmitting the port mapped filtered RS using a corresponding antenna via a multiple input multiple output (MIMO) communication network.

12. The method of claim 1, wherein the data filter has a one-to-one correspondence with the RS filter, and wherein the transmitter is configured to receive an explicit indication of one of the RS filter and the data filter.

13. The method of claim 1, wherein determining the RS filter comprises applying an M-point DFT on the data filter, down-sampling the output of the M-point DFT by a P value to obtain a down-sampled sequence, and performing zero insertion on the down-sampled sequence to generate an M-length frequency domain RS filter.

14. The method of claim 1, wherein the method comprises performing at least one of: a subcarrier mapping on the port mapped filtered RS and the filtered data using a plurality of subcarriers to generate a sub-carrier mapped output; an inverse Fast Fourier Transform (IFFT) on the sub-carrier mapped output to obtain time domain output; and a cyclic prefix (CP) operation on the time domain output to generate a waveform, wherein the generated waveform comprises at least one of an optimized peak to average power ratio (PAPR), an optimized cross correlation, and an optimized error-rate performance on every port of the transmitter.

15. A method for generating a waveform in a communication network, the method comprising: rotating, by a transmitter, at least one modulated data and at least one modulated reference sequence (RS) to produce rotated modulated data and rotated modulated RS; precoding, by the transmitter, the rotated modulated data and the rotated modulated RS using a data filter and a RS filter respectively, to produce a precoded data and precoded RS; transforming, by the transmitter, the precoded data and the precoded RS using Discrete Fourier Transform (DFT) to generate transformed precoded data and transformed precoded RS; port mapping, by the transmitter, the transformed precoded RS to a corresponding port of the transmitter to obtain port mapped transformed RS; mapping, by the transmitter, the port mapped transformed RS and the transformed precoded data using a plurality of subcarriers to generate a sub-carrier mapped output; and generating, by the transmitter, a waveform by performing Orthogonal Frequency Division Multiplexing (OFDM) modulation on the sub-carrier mapped output.

16. The method of claim 15, wherein the transmitter is configured for generating at least one modulated data and at least one modulated reference sequence (RS) corresponding to a port of the base station.

17. The method of claim 16, wherein modulation performed on the at least one data and at least one RS is one of binary phase shift keying (BPSK), 8-phase shift keying (PSK), quadrature amplitude modulation (QAM) and quaternary phase shift keying (QPSK).

18. The method of claim 15, wherein the at least one modulated RS is of length M/P, where M is data sequence length, and P is number of ports.

19. The method of claim 18, wherein number of ports P is either pre-defined or explicitly indicated to the transmitter or a group of transmitters.

20. The method of claim 15, wherein the data filter has one to one correspondence with the RS filter, where one of RS filter and data filter may be explicitly indicated to the transmitter.

21. The method of claim 15, wherein the RS filter is one of 1+D, 1-D, 0.26D-1+0.92+0.26D, and −0.26D-1+0.92-0.26D, where D is a delay element.

22. The method of claim 15, wherein the data filter and RS filter are explicitly indicated to a receiver.

23. The method of claim 15, wherein the method comprises transmitting the waveform using a corresponding antenna via a multiple input multiple output (MIMO) communication network.